A low-THD class-D audio amplifier with dual-level dual-phase carrier pulsewidth modulation

Shang Hsien Yang*, Yuan Han Yang, Ke-Horng Chen, Ying Hsi Lin, Tsung Yen Tsai, Shian Ru Lin, Chao Cheng Lee

*Corresponding author for this work

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

In this paper, a class-D audio amplifier which combines the advantages of the phase-shifted carrier pulsewidth modulation (PWM) and the multiple-level carrier PWM is proposed with a dual-level dual-phase carrier (DLDPC) PWM. The proposed closed-loop amplifier includes a second-order integrator and a DLDPC triangular wave generator. Two sets of 180° out-of-phase triangular waves are used as carriers, and each set has its respective offset voltage level with nonoverlapping amplitude. By performing the double Fourier analysis, it can be found that the linearity can be enhanced and the distortion can be reduced with the proposed modulation. Experimental results show that the proposed fully differential DLDPC PWM class-D audio amplifier features a total harmonic distortion lower than 0.01% with an output voltage swing of ±5V.

原文English
文章編號7130610
頁(從 - 到)7181-7190
頁數10
期刊IEEE Transactions on Industrial Electronics
62
發行號11
DOIs
出版狀態Published - 1 十一月 2015

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